I currently have 108 English manga + 10 Japanese manga (and 3 light novels, 4 artbooks and more random stuff). My longer series include FMA (1-25 and 14 in Japanese), BLEACH (1-21, 23) and DNAngel (1-13). I also only read 2 manga online, but it's so much better to buy the books.

151 volumes. I have a list saved on my computer too, it makes it easier to keep track . Especially since eventually I want enough to fill 10 bookshelves or so. Unfortunately I have only been collecting since January so my collection doesn't amount to a lot... yet .

I'm currently collecting School Rumble and just keeping up with my ongoing series. I think the next ones will be Pandora Hearts 6 and Black Butler 6 (The start of the circus arc!!!) in about 20 days... I think

Over the last ten years, my girls and I have collected about 200 titles, this amounts almost 1000 volumes. then there's the anime...
We also read manga online that's not available here, when or if it becomes available, we buy it to support the mangaka (they gotta eat too y'know) our house is sort of like a live in book case. We attend Anime Expo annually and the girls cosplay while I buy anime and manga.
Oh yes, they are also serious gamers.

Like 20. The most I have from any given series is 4 or so. I'm not really into owning manga; I read most of it by getting it out from the library or reading it online (including fan translations for ones that haven't come out in English yet).